CHICAGO – The U.S. Department of Labor has cited a Frankfort-based utility construction company for repeatedly exposing employees to excavation safety hazards after federal investigators observed employees working in an unprotected trench.The department’s Occupational Safety and Health Administration initiated an investigation of Always Underground LLC as part of its National Emphasis Program on Trenching after witnessing employees working in an unprotected trench deeper than eight feet.OSHA cited the employer for three repeat violations for failing to provide workers with a safe means of egress, to install a trench protective system that would protect against cave-ins, and to keep excavated or